Because implied powers are not explicit the is often left to decide what constitutes an implied power.

Courts

Explanation: Implied powers have been in existence in the United States even before the Constitution was enacted,it is required for effective and efficient execution of Government functions,since it is not explicit (not written),it is left to the Courts to decide what can be called implied powers,Implied powers were used during the formation of the First Bank of America. The Congress has implied powers to create Agencies of Government.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )

is there a year set? the question is incomplete